Admin page CSS not working

OK, so I just installed 1.0 RC3 with integration for WP2.8. When I goto the bb-admin pages, the CSS is not working properly for *most* of the admin pages.

I say *most*, because it seems fine for pages in the “Settings” area, and the left sidebar/menu is displaying correctly on all pages, but the core parts of all other admin pages are displaying without formatting.

Could I have an incomplete styles.css file in bb-admin? Could it be something else?